Most switches have a standby power circuit, switching power supply in standby mode still oscillating, but the frequency of normalworking hours than lower.
大多数开关电源有待机电路，在待机状态开关电源还在振荡，只是频率比正常工作时要低。
2
In order to keep the normal operating state of a electro motor, the workingfrequency of the electro motor should be much lower than that of natural frequency.
为防止共振发生，电动机的工作频率应远远小于其固有频率。
3
If the working-frequency discharging voltage value exceed normal range, can faintly adjust the discharge gap.